Response Of Iowa pavements to a tracked agricultural vehicle
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2000-12-01
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Abstract:The overall objective of the work summarized in this report and in the interim report was to study the effects of targeted implement-of-husbandry loads. This report is to complement Phase I of this work, which was summarized in the interim report, "Response of Iowa Pavements to Heavy Agricultural Loads" (December 1999). The response of newly constructed portland cement concrete (PCC) and asphalt cement concrete (ACC) pavements under semi-truck, single-axle single-tire grain wagon, single-axle dual-tire grain wagon, tandem and tridem honey wagons were summarized in the interim report. Phase II of this project, presented herein, was to complete the study in terms of how tracked agricultural vehicles relate to the reference 20,000-lb single-axle semi-truck. In this report the response of these two pavements under a tracked grain wagon is documented. The analysis results illustrate during the spring season, because of the larger track-pavement contact area, the load associated with the tracked wagon required to induce the same stress in the ACC and PCC pavements was significantly higher than that of a 20,000-lb single-axle dual-tire semi. For example, for a 36-in. wide and 116-in. long track-pavement contact area, analysis showed that an axle load of 82,000 lb induced stress in the ACC pavement equal to that induced by a 20,000-lb reference semi. A tracked wagon loaded to the maximum-allowable gross vehicle load of 96,000 lb induces a stress less than that induced by the single-axle dual-tire semi on PCC pavement. The limited field test and analytical results demonstrated a similar response of the two newly constructed PCC and ACC pavements under tracked wagons. These vehicles induced lower stress and strain values in both types of pavements when compared to other loads. Therefore, one may conclude that these types of vehicles are more efficient in distributing their loads than are other types of vehicles of husbandry. However, in the authors' opinion, the roughness of the pavement surfaces, rutting, fatigue cracking, and other distress factors that could affect the performance of the pavements need to be investigated. This is necessary because the work summarized herein and in the interim report was limited to testing and analyzing two newly constructed pavements.
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